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Rains heavily on squads, say (5)

Ross

I believe the answer is:

teems

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'rains heavily' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for teems that I've seen before include "Pours down" , "Buckets down" , "Abounds, swarms" , "Rains heavily" .)

I've seen this clue in The Mirror.
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